Blade-attaching device for metallic cutting-machines.



C-. H. DRIVER.

BLADE ATTACHING DEVICE FOR METALLIC CUTTING MACHINES.

APPLICATION FILED NOV. 15. I9I7.

1,281,148. Patented O0t.8,1918.

NITE NT @IE.

CHARLES H. DRIVER, OF RAGINE, WISCONSIN, ASSIGNOR TO 3'. MOORES J ONES, OF

RACINE, WISCONSIN.

I Specification of Letters ,Patent.

Patented Oct. 8, 1918.

AppIicatiOn filed November 15, 1917. Serial No. 202,173.

To all whom it may concern:

Be it known that I, CHARLES H. DRIVER, a citizen of the United States, and resident of Racine, in the county of Racine and State of Wisconsin, have invented certain new and useful Improvements in Blade-Attaching Devices for Metallic Cutting-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to certain new and useful improvements in metallic cutting machines and refers more particularly .to that type known as power hack saws.

The present manner of securing a hack saw blade in its frame by providing its ends with apertures engaging a pin or stud carried by the blade attaching members is faulty, in that the blade is not held true in its frame, and my invention has for its primary object to provide novel means for rigidly securing the blade in its frame so that each end thereof will be firmly held flush against its attaching bar or member and thus retained in the frame.

WVith the above and other objects in view which will appear as the description pro ceeds, my invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended clalms, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles thereof, in which:

Figure 1 is a side elevational view of a portion of the outer end of a power hack saw frame equipped with my device.

Fig. 2 is a longitudinal sectional view through the inner end of the blade attaching bar taken on the line 22 of Fig. 1.

Fig. 3 is a transverse sectional View through one end of the hack saw blade looking at the inner end of the blade attaching bar and being taken on the line 3-3 of Fig. 1, and

Fig. i is a view, partly in section and partly in elevation, taken on line H of Fig. '2.

Referring now more particularly to the accompanying drawings the numeral 1 designates one of the vertical legs or members ofa hack saw blade retaining frame, as in this instance the outer leg member, in the end of whichis slidably mounted a blade attaching bar or member 2 having its inner end provided with novel means for engaging one end of the hack saw blade 3'and its outer end provided with a series of studs or projections 1 adapted to be engaged by the lower end of a fulcrum lever 5 having its upper end engaged by a tensioning screw or nut 6, all of which are of well known construction and constitutes no part of the present invention.

As will be readily understood, my invention is also applied to the stationary blade attaching member carried by the rear leg of the hack saw frame (not shown), but for the purpose of illustration the same has been depicted in the drawings as secured to the adjustable blade attaching bar or member 2 and resides essentially in providing the in; ner" end of the attaching bar with an inwardly tapered portion 7 forming a consequent shoulder 8 at its termination and slidably mounted on the tapered portion is a yoke 9.

Said yoke is substantially U-shaped and straddles'the bar 2, the ends of its arms having a plate 11 secured thereto by rivets or the like 12. The inner face with the plate is inclined as at 10 for coacting engagement with the tapered portion of the bar 2, whereby when stress is applied to the latter, its fiat face will move toward the similar face of the base of the yoke. The plate 11 has an aperture 13 registering with an aperture 13 in the base of the yoke 9 and a slot 13" in the bar 2 and, through said apertures and slot, a pin 1 1 is passed to engage the aperture 3 of the blade 3. The blade 3 is secured between the inner face of the base and the inner flat face or rear wall of the attaching bar 2 and the end of said pin 14 engages the aperture 3 provided in each end of the hack saw blade, the yoke and inner end of the attaching bar 2 being recessed as at 15 to provide space for the pitch of the hack saw blad as best shown in. Fig. 3.

As will be apparent from Fig. 2, when the blade is to be inserted in the hack saw frame,

' ture l8, and upon the tensioning of the binding screw 6 the fulcrum leverv 5 will draw bar 2 outwardly, causing the cam faces of the yoke 9 and bar 2 'to co-act to firmly bind the blade flush against bar 2 and thus securely retain the same true in the hack saw frame, as will be obvious.

As before stated, any form of tensioning means may be employed in place of the fulcrum lever 5 and binding screw 6 and the inner stationary blade attaching bar or member (notshown), is equipped with the device hereinbefore described.

I claim:- 1

1. A device of the character described comprising an attaching member, a yoke member carried thereby, said yoke member having apertures therein alining with a slot in one end of said attaching member, a pin engaging the said apertures for retaining the end of a hack saw blade between the yoke member and said attaching member, and meansindependent of said pin for rigidly binding the end of said blade between i said yoke member and attaching member.

2. A device of the character described comprising an attaching bar, a substantially U-shaped yoke member slidably straddling said bar, a pin extending through said yoke member and bar to attach a saw blade thereto, and means independent of the pin and carried by the yoke member for cooperative engagement with the attaching bar to rigidly bind the end of the blade between the yoke member and the attaching bar when stress is applied to the last mentioned parts.

'3. A device of the character described comprising an attachingbar provided on one side adjacent one end with an inclined face, the other side being flat, a substantially U- shaped' yoke member slidably straddling said end of the bar, a plate secured between the ends of the arms of the yoke member, the

. inner face ofsaid plate being inclined for CHARLES H. DRIVER.

Copies of this patent may be obtained for five'cents each, by addressing the Commissioner of Patents,

' Washington, D. 0. 

